JPH0649395Y2 - Forging press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a forging press.

(Prior Art) An example of a conventional forging press is shown in FIGS. 3 to 5.

In FIG. 5, 20 is the body of the forging press, 21 is the upper die, 1
Is the lower mold.

The lower mold 1 is gripped by the bolster 30, and this bolster 30
Are mounted on the wedge 4. The wedge 4 is slidably supported on an inclined surface 20a formed on the press body 20, and moves the wedge 24 forward and backward along a direction perpendicular to the plane of the drawing to move up and down while sliding left and right on the inclined surface 20a. It is like this.

12 is a rod for moving the knockout pin up and down,
It can be moved up and down via a rotary shaft 22 and an arm 23.

Details of the bolster 30 are shown in FIGS.

The bolster 30 includes a bolster body 3, a clamp mechanism 2, a hard plate 13, a knockout pin 7, a knockout bar 6, a knockout lever 9, a push-up pin 11 and the like.

The lower mold 1 is placed on the hard plate 13 placed on the bridge-shaped portion 3a of the bolster body 3, and is fixed to the bolster body 3 by the clamp mechanism 2. This bolster body 3
Are mounted on the wedge 4. The hard plate 13 is provided with two elongated holes 5 penetrating vertically through the hard plate 13, and knockout bars 6 are housed in the elongated holes 5 so as to be vertically movable. The lower ends of a plurality of knockout pins 7 penetrating holes 26 formed in the lower mold 1 are brought into contact with the upper surface of the knockout bar 6. A recess 8 is formed on the lower surface of the bolster body 3, and a pair of knockout levers 9 are housed in the recess 8. These knockout levers 9 are pivotally supported around a shaft 10 that penetrates the two legs 9b thereof, and four holders 18 that support both ends of these two shafts 10 are fixed to the bolster body 3, respectively. Has been done. Hole 27 drilled in the bridge 3a of the bolster body 3
A plurality of push-up pins 11 pass through the push-up pin 11, the upper end of the push-up pin 11 abuts the lower surface of the knockout bar 6, and the lower end abuts the enlarged portion 9a of the knockout lever 9. 12
Is a rod penetrating a hole 28 formed in the wedge 4, and 24 is a wedge.

Then, the load applied to the lower mold 1 is the hard plate 1
It is supported by the press body 20 via the bridge portion 3a, the bolt body 3 and the wedge 4.

When the wedge 24 is moved back and forth in the direction of arrow A in FIG. 3, the wedge 4 moves up and down in the direction of arrow C while sliding in the direction of arrow B.

Then, when the rod 12 is raised, the rod 12
The upper end of the abutting contact each tip of the pair of knockout levers 9 to rotate the knockout lever 9 around the shaft 10 upward. When the push-up pin 11 is pushed up by the knock-out lever 9, the knock-out bar 6 moves upward, and accordingly, the plurality of knock-out pins 7 project upward from the lower die 1 to lower the place-formed work. Lift from mold 1.

(Problems to be Solved by the Invention) In the conventional forging press described above, the upper die 21 is moved up and down, and the work is repeatedly clamped by the upper die 21 and the lower die 1 to perform the forming process. Therefore, a large load (10 to 12 tons / cm ² ) is repeatedly (about 600 times / hour) applied to the bolster 30. Therefore, when the forging is repeated, a bending load is repeatedly applied to the bridge-shaped portion 3a of the bolster body 3, so that a crack 14 (see FIG. 4) occurs in the shoulder portion of the recess 8 due to fatigue in about 10 months. Then the bolster
Clamp mechanism 2 attached to other parts of bolster 30 and bolster 30
However, there is a problem in that it requires a great deal of money, although it is still usable.

(Means for Solving Problems) The present invention has been proposed to address the above problems, and the gist of the present invention is to hollow out the central portion of the bolster body 3 and penetrate it vertically. A through hole 15 is provided, an insert 16 fitted in the through hole 15 is placed on the wedge 4 slidably supported by the press body 20, and the insert 16 is placed on the insert 16 via the hard plate 13. Type 1
Is mounted, and a recess 17 is formed in the upper surface of the wedge 4, and a knockout lever 9 that is swung up and down by a rod 12 that penetrates the wedge 4 and moves up and down is accommodated in the recess 17. Along with the vertical movement of the knockout lever 9, a push-up pin 11 that vertically penetrates the insert 16,
The forging press is characterized in that the lower die 1 is transmitted to a knockout pin 7 that penetrates up and down through a knockout bar 6 that is vertically movable in the hard plate 13.

(Operation) In the present invention, since a large repetitive load acting on the lower die 1 is transmitted to the press body 20 via the hard plate 13, the insert 16 and the wedge 4, it does not act on the bolster body 3 as a bending load. Absent.

(Embodiment) One embodiment of the present invention is shown in FIGS. 1 and 2.

A through hole 15 is formed by hollowing out the central portion of the bolster body 3 and penetrating vertically, and an insert 16 made of tool steel having the same shape and size as that of the through hole 15 is fitted in the through hole 15. The lower surface of the insert 16 is placed on the wedge 4, and the hard plate 13 is placed on the insert 16. A recess 17 for accommodating the knockout lever 9 is formed on the upper surface of the wedge 4, and a holder 18 that pivotally supports the rotary shaft 10 of the knockout lever 9 is fixed to the wedge 4. Further, the insert 16 is provided with holes 29 through which the plurality of push-up pins 11 pass.

Other configurations are similar to those of the conventional one shown in FIGS. 3 to 5, and corresponding members are designated by the same reference numerals.

Therefore, a large repetitive load acting on the lower die 1 is transmitted to the press body 20 via the hard plate 13, the insert 16 and the wedge 4, and is not applied to the bolster body 3.

And, unlike the conventional case, the bolster body 3 does not have the recess 8 formed on the lower surface thereof, and therefore does not have the bridge portion 3a.
The crack 14 does not occur on the shoulder of the recess 8 unlike the conventional case.

(Effect of the Invention) In the present invention, the central portion of the bolster body 3 is hollowed out to form a through hole 15 penetrating vertically, and the insert 16 fitted in the through hole 15 is slidable on the press body 20. This insert is placed on the wedge 4 supported by
Since the lower mold 1 is placed on the 16 through the hard plate 13, the large repetitive load acting on the lower mold 1 is not applied to the bolster body 3 and the hard plate 13 and the insert
16, transmitted to the press body 20 via the wedge 4, and is borne by the press body 20. Therefore, the supporting rigidity of the lower mold 1 is improved, and the size and quality of the work can be stabilized.

Since the recess 17 for accommodating the knockout lever 9 is formed on the upper surface of the wedge 4 and not on the lower surface of the bolster body 3 as in the conventional case, the bolster body 3
Since there is no bridge portion in the bolster body, and therefore the bolster body 3 is not cracked, the life of the bolster body 3 can be extended from 10 months to about 3 years.

If the insert 16 becomes fatigued due to a large cyclic load acting on it, only this needs to be replaced, and the bolster body 3 and the clamp mechanism 2 attached to it can be used as they are, so maintenance and maintenance are easy, and The cost can be greatly reduced.

[Brief description of drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part, and FIG. 2 is an exploded perspective view of the main part. 3 to 5 show an example of a conventional forging press,
FIG. 3 is an exploded perspective view of the bolster and members in the vicinity thereof, FIG. 4 is a vertical sectional view of the bolster and members in the vicinity thereof, and FIG. 5 is a front view showing a partially cutaway forging press. Lower mold …… 1, bolster …… 30, bolster body …… 3, through hole …… 15, insert …… 16, press body …… 20, hard plate …… 13, wedge …… 4, knockout lever …… 9 , Recesses, 17, rods, 12, push-up pins,
… 11, knockout bar …… 6, knockout pin ……
7

Claims (1)

[Scope of utility model registration request] 1. A wedge in which a central portion of a bolster body 3 is hollowed out to form a through hole 15 penetrating vertically, and an insert 16 fitted in the through hole 15 is slidably supported by a press body 20. The lower mold 1 is placed on the insert 16 via the hard plate 13 and a recess 17 is bored in the upper surface of the wedge 4 and the wedge 4 is placed in the recess 17. A knockout lever 9 that is swung up and down by a rod 12 that penetrates and moves up and down is housed, and the up and down movement of this knockout lever 9 is performed by the insert 16 described above.
Push-up pin 11 that penetrates up and down, the hard plate 13
A forging press characterized in that the lower die 1 is transmitted to a knockout pin 7 which penetrates vertically through a knockout bar 6 which is vertically movably housed therein.